Rear bumper for an automobile



FIG. 1 is a front elevational view of a rear bumper for an automobile showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a front perspective view thereof showing also the rear side of the right side wing thereof.

The rear side of the left wing thereof is the mirror image of the rear side of the right side wing and the rear side of the front panel is the reverse image of the front side thereof. 

The ornamental design for a rear bumper for an automobile as shown and described. 